182 DISEASES OF ECONOMIC PLANTS 



large, irregular blotches. The disease is also very injuri- 

 ous in its attacks upon the fruit stems, resulting in 

 diminution of food supply to the fruit and its improper 

 development. 



It attacks all varieties, precluding the use of especially 

 susceptible varieties in some localities, often killing 

 the plants, and in any event lessening their vigor and 

 productiveness. In some localities entire plantings have 

 been destroyed. One grower reports a loss of $1500 on 

 a six-acre field in one season. 



Moisture and heat favor the disease, while moisture, 

 dew, etc., upon the leaves are necessary to infection. 

 Weather favorable to infection followed by hot, dry days 

 may be attended by' great injury. Plants growing upon 

 heavy, wet, undrained soil suffer more than those upon 

 dryer soil. 



The following comparison of resistance is quoted': — 



"1. Bhght very rare — Daisy, Eureka, Jewell, Tri- 

 umph de grande. 



" 2. Bhght rare — Belmont, Lady Rusk, Scarlet Queen. 



"3. Blight frequent — Annie Forest, Bomba, Bubach, 

 Burt, Captain Jack, Covill, Crawford, Cumberland Tri- 

 umph, Dutter, Candy, Gold, Gypsy, Haverland, Hender- 

 son, Itaska, Jessie, Lida, Logan, Mammoth, May King, 

 Miami, Ontario, Parry, Pearl, Phelps, Pineapple, Primo, 

 Summit, Sunset. 



" 4. Blight abundant — Barton's Eclipse, Cloud, Gandy 

 Pride, Great America, Loudon's 15, Piper. 



" 5. Bhght very abundant — Monmouth, Ohio, Photo, 

 Sanafee, Warfield." 



> Garman, H., Ky. Agr. Exp. Sta. Bui. 31, p. 13. 



